Ulsan HD FC, formerly Ulsan Hyundai FC, is a South Korean professional football club based in Ulsan that competes in the K League 1, the top tier of South Korean football. Founded in 1983 as Hyundai Horang-i, they joined the K League in 1984. Their home ground is Ulsan Munsu Football Stadium. The club is owned by HD Hyundai Heavy Industries.

Ulsan, officially the Ulsan Metropolitan City, is South Korea's seventh-largest metropolitan city and the eighth-largest city overall, with a population of over 1.1 million inhabitants. It is located in the south-east of the country, neighboring Busan to the south and facing Gyeongju to the north.